https://blog.youkuaiyun.com/qq_42103279/article/details/108714237
https://www.jianshu.com/p/ed201ae501d8
lvextend命令
-L:指定逻辑卷的大小,单位为“kKmMgGtT”字节;
-l:指定逻辑卷的大小(LE数)
[root@localhost ~]# df -h
文件系统 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root 50G 1.3G 49G 3% /
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 1.9G 0 1.9G 0% /dev/shm
tmpfs 1.9G 9.0M 1.9G 1% /run
tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup
/dev/sda1 1014M 148M 867M 15% /boot
/dev/mapper/centos-home 46G 33M 46G 1% /home
tmpfs 379M 0 379M 0% /run/user/0
[root@localhost ~]# umount /home
[root@localhost ~]# lvremove /dev/mapper/centos-home
Do you really want to remove active logical volume centos/home? [y/n]: y
Logical volume "home" successfully removed
[root@localhost ~]# lvexten